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Method for quantitative analysis of sulfur and phosphorus in steel

A quantitative analysis and iron and steel technology, applied in the field of spectral quantitative analysis, can solve the problems of long measurement period, inability to control the production process, instability, etc., and achieve the effects of saving sample processing time, improving production line capacity, and reducing volatility

Active Publication Date: 2018-08-17
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 1. It requires complex sample pretreatment process, which reduces the detection efficiency;
[0007] 2. The measurement cycle is long, the content of various elements cannot be fed back in time, and the production process cannot be effectively controlled, resulting in waste of raw materials or unstable steel quality, and at the same time restricting the rapid development of the steel industry

Method used

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  • Method for quantitative analysis of sulfur and phosphorus in steel
  • Method for quantitative analysis of sulfur and phosphorus in steel
  • Method for quantitative analysis of sulfur and phosphorus in steel

Examples

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Embodiment 1

[0031] In the laser-induced breakdown system of this embodiment, the excitation source is Nd:YAG solid-state laser (wavelength is 1064nm, pulse width is 10ns, laser energy is adjustable from 4 to 80mJ, and laser emission frequency is 5Hz), and the laser pulse is focused on Plasma is excited on the surface of the sample, and the spectral signal is transmitted to the echelle spectrometer (the wavelength range is 200-800nm, and the resolution is about 0.1nm). During the experiment, in order to obtain the spectrum with good signal-to-noise ratio, each spectrum is obtained by 20 signal accumulations.

[0032] The present invention combines laser-induced breakdown spectroscopy and an internal standard method for quantitative analysis of sulfur and phosphorus in iron and steel, specifically comprising the following steps:

[0033] 1. Sample preparation: Make the sample to be tested and the standard-building sample with known component content into a cylinder of Φ20×6mm; there are 5 s...

Embodiment 2

[0046] The present invention combines laser-induced breakdown spectroscopy and internal standard method for quantitative analysis of sulfur and phosphorus in steel:

[0047] The samples to be tested are chromium steels 20Cr, 20CrMo and 20CrNiMo purchased in the market, and the samples to be tested are made into cylinders of Φ20×6mm.

[0048] Using the same test method and test conditions as in Example 1, the laser-induced breakdown spectrum signals were collected from the 3 samples to be tested, and the standard curve of SII 233.249nm and PI 253.560nm established in Example 1 were used to analyze and obtain the samples to be tested. The quantitative analysis results of S and P elements in the samples are as follows.

[0049]

Embodiment 3

[0055] In this example, the standard curve of SII 233.249nm and the standard curve of PI 253.560nm established by the first implementation are used, and the laser-induced breakdown system and the computer system for establishing the standard curve are set up on the production site. The steel samples on the production line can be processed without pretreatment. Detection is performed directly, thereby enabling in-situ, on-line sulfur and phosphorus quantification of steel samples.

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Abstract

The invention discloses a method for quantitative analysis of sulfur and phosphorus in steel. The method comprises the following steps: preparation of standard establishing samples; adjustment of theparameters of a laser induced breakdown system; collection of laser induced breakdown spectrum signals; establishment of standard curves for SII 233.249 nm and PI253.560 nm based on an internal standard method; collection of the signals of the sample to be tested; and acquisition of the S / P quantitative analysis result of the sample to be tested according to the standard curves. The method of theinvention integrates the internal standard method with laser induced breakdown spectroscopy and can thus rapidly detect the contents of elemental sulfur and elemental phosphorus in situ.

Description

technical field [0001] The invention belongs to the technical field of spectral quantitative analysis, and relates to a quantitative analysis method for sulfur and phosphorus in iron and steel, in particular to a quantitative analysis method for sulfur and phosphorus in iron and steel combining laser-induced breakdown spectroscopy and an internal standard method. Background technique [0002] The composition of various elements in steel has an important impact on the quality of steel. In order to ensure the quality of steel, the content of main elements is often detected in real time and quickly during the smelting process. As relatively common impurity elements in steel, sulfur and phosphorus have a great influence on the properties of steel. The main source of sulfur is the raw materials added in the smelting process and the corresponding combustion products. It can improve the machinability of steel, but also cause hot embrittlement of steel, resulting in cracking and ot...

Claims

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Application Information

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IPC IPC(8): G01N21/71
CPCG01N21/718
Inventor 丁宇严飞陈海秀
Owner NANJING UNIV OF INFORMATION SCI & TECH
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